The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here:

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Bild på Maria von Post. Foto.

Maria von Post

Postdoctoral fellow

Bild på Maria von Post. Foto.

Species-Dependent Effects of the Urban Environment on Fatty Acid Composition and Oxidative Stress in Birds


  • Caroline Isaksson
  • Martin N Andersson
  • Andreas Nord
  • Maria von Post
  • Hong-Lei Wang

Summary, in English

Ecological impacts of urbanization include the loss of biodiversity and changes in species composition and population densities. However, how the urban environment affects fundamental physiological parameters is largely unknown. Here, we investigated physiological components related to health and nutrition, namely, plasma fatty acids (FA) and lipid peroxidation at inter-habitat and interspecific levels. Specifically, we compared four passerine bird species—the great tit (Parus major), the blue tit (Cyanistes caeruleus), the house sparrow (Passer domesticus), and the tree sparrow (P. montanus)—from urban and rural environments. Significant interactions between species and habitat were revealed for the majority of the FAs. Interestingly, the observed inter-habitat variation in FAs was frequently in opposite directions when comparing species from the two families (tits, Paridae; sparrows, Passeridae). These patterns suggest that sparrows and tits feed on different food sources, or modulate their FA metabolism differently, across the urban-rural gradient. By using canonical discriminant analyses (CDA), we further demonstrated species-specific signals in FA composition, with misclassification of species being <1% within habitats and <7% between habitats. Finally, the urban-rural FA differences between species and families were manifested in two indices of health. Firstly, urban blue tits had a higher total ω-6/ω-3 polyunsaturated FA ratio than rural conspecifics, which is believed to increase inflammatory responses. Secondly, urban sparrows of both species showed higher lipid peroxidation indices (indicating a higher susceptibility to lipid peroxidation if exposed to pro-oxidants), and consequently, a higher level of lipid peroxidation compared to their rural conspecifics. Collectively, the species- and habitat-specific differences in plasma FA composition, which are linked to nutrition and metabolism, suggest that the urban environment affect tits and sparrows primarily via two different pathways—inflammation and oxidative stress, respectively,—with potential consequences for the health of urban populations.


  • Evolutionary ecology
  • Functional zoology
  • Biodiversity
  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Biodiversity and Conservation Science
  • Life History and Functional Ecology

Publishing year





Frontiers in Ecology and Evolution



Document type

Journal article


Frontiers Media S. A.


  • Zoology
  • Ecology


  • oxidative stress
  • urban ecology
  • Urbanization
  • fatty acid
  • ornithology
  • diet
  • lipid peroxidation
  • omega-3
  • omega-6
  • Paridae,
  • Passeridae
  • polyunsaturated fatty acid
  • urbanization
  • Parus major
  • Cyanistes caeruleus
  • Passer domesticus
  • Passer montanus



Research group

  • Biodiversity and Conservation Science
  • Life History and Functional Ecology


  • ISSN: 2296-701X